functionSyntax.js

// a function that take one argument x and returns itself
function(x) { return x;}
// a function that take nothing; but this will not be used
// naming a function is do as
var functionName = function (x) { // do something with x
	return x; 
};
// also 
function functionName(x) { //... 
	return x;
};
// with ES6 spec for JS, the new function syntax is
(x) => { // do something with x
	return x;
}